US9398389B2 - Apparatus for securing components in an electret condenser microphone (ECM) - Google Patents
Apparatus for securing components in an electret condenser microphone (ECM) Download PDFInfo
- Publication number
- US9398389B2 US9398389B2 US14/273,041 US201414273041A US9398389B2 US 9398389 B2 US9398389 B2 US 9398389B2 US 201414273041 A US201414273041 A US 201414273041A US 9398389 B2 US9398389 B2 US 9398389B2
- Authority
- US
- United States
- Prior art keywords
- diaphragm
- charge plate
- stitch
- support structure
- ring support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
- 239000004593 Epoxy Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 15
- 229920001721 polyimide Polymers 0.000 claims description 11
- 239000004642 Polyimide Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims 3
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 238000013459 approach Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000010255 response to auditory stimulus Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/01—Electrostatic transducers characterised by the use of electrets
- H04R19/016—Electrostatic transducers characterised by the use of electrets for microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
Definitions
- This application relates to acoustic devices and, more specifically, securing the internal components of these devices.
- acoustic devices Various types exist and one such type of device is a microphone.
- the Electret Condenser Microphone (ECM) is being used in devices such as cellular phones, video cameras, studio performance microphones, and headphones to mention a few examples.
- ECM electrostatic discharge memory
- sound energy enters through a sound port and vibrates a diaphragm and this action creates a corresponding change in electrical potential (voltage) between the diaphragm and a charge plate disposed near the diaphragm.
- This voltage represents the sound energy that has been received.
- the voltage is then transmitted to an electric circuit (e.g., an integrated circuit such as an application specific integrated circuit (ASIC)). Further processing of the signal may be performed on the electrical circuit. For instance, amplification or filtering functions may be performed on the voltage signal at the integrated circuit.
- ASIC application specific integrated circuit
- the diaphragm and charge plate combination In order for the diaphragm and charge plate combination to function properly, they need to be secured within the microphone. If, for example, the distance separating them changes in an unexpected way (in the absence of the diaphragm moving in response to sound energy), then the microphone will not function properly.
- the connection between the charge plate and diaphragm provides mechanical support and is sometimes referred to as a “stitch”, due to its shape.
- the connection between the diaphragm and housing provides mechanical support and an air-tight seal around the perimeter of the diaphragm.
- Various attempts have been made to provide mechanical support and an air-tight seal, but these attempts have various shortcomings.
- FIG. 1 comprises a side cutaway view of an ECM showing a stitch according to various embodiments of the present invention
- FIG. 2 comprises a perspective view of an ECM with a stitch according to various embodiments of the present invention
- FIG. 3 comprises a top view of an ECM with a stitch according to various embodiments of the present invention.
- FIG. 4 comprises a flow chart for making an ECM with a stitch according to various embodiments of the present invention.
- a stitch typically comprised of epoxy, is used to hold a charge plate and a diaphragm and to, in the absence of sound energy, maintain a constant or substantially constant distance between these elements.
- sealing material typically comprised of epoxy, is applied around the perimeter of a diaphragm to create an air-tight seal around its perimeter.
- a stitch or other securing device can be made of a smaller size and this allows for smaller microphones and more available back volume; hence, more microphone sensitivity is provided. This is particularly advantageous for situations where the microphone needs to be as small as possible (e.g., in portable electronic devices and hearing aid applications).
- the present approaches also provide for increased mechanical strength than adhesive only stitches, specifically amongst its motor components. This allows for better mechanical performance when mechanical shocks impact the microphone.
- the present approaches also provide for reduced vibration sensitivity capability.
- the thickness of the stitch can be increased more precisely than with epoxy only stitches, which reduces vibration sensitivity.
- a motor in many of these embodiments, includes a diaphragm and a charge plate.
- the diaphragm is separated from the charge plate by a constant distance.
- the separation is secured using a stitch that is constructed from a b-stage epoxy bonded to a polyimide layer, such as Kapton (manufactured by Dupont corporation).
- the acoustic apparatus is a motor for an ECM.
- the apparatus 100 includes a charge plate 102 , a diaphragm 104 , a diaphragm ring 106 , and a stitch 108 .
- these components are together referred to as an ECM motor.
- the charge plate 102 is a conventional charge plate that is used in ECMs and the diaphragm 104 is a conventional diaphragm (e.g., a film material) used in ECM devices.
- the ring 106 secures the diaphragm 104 .
- the charge plate 102 and diaphragm 104 are separated by a distance “d.” In the absence of sound energy, this distance d is maintained to be a constant distance or a nearly constant distance.
- the stitch 108 is, in one example, constructed of “b-stage” epoxy 107 backed with a polyimide film 109 .
- the polyimide e.g., Kapton
- the polyimide gives the b-stage epoxy a more sturdy mechanical structure, which makes for ease of shape designing, cutting, and handling with reduced risk of breakage and shape deformation.
- the b-stage epoxy bonds to the charge plate and adjacent diaphragm ring 106 to secure the motor.
- the b-staged epoxy used in the stitch 108 is a semi-solid form of partially cured epoxy. It is used between (e.g., midway between) the liquid state of blended, but partially cured resins, and a final state of a fully formed polymer. “B-stage” epoxy has been heat cured for a short period of time and then cooled (quenched) to prevent complete polymerization of the resin system. As discussed elsewhere herein, this midway solid state can expand manufacturing options. B-stage epoxy can be provided in a number of options such as in rolls or sheets.
- the epoxy With the epoxy having been partially cured (e.g., less than approximately 10 percent), it is available for bonding parts together (i.e., the charge plate and diaphragm). In other words, the epoxy and its polymerization are “staged” in order to facilitate the overall process. Later, the epoxy is re-heated to reactivate polymerization and complete the curing cycle.
- the blending/depositing process (blending of resin and hardener, then depositing the liquid on a substrate) is separated from the curing process (after the liquid is deposited, immediately curing the liquid with time or heat) thereby adding flexibility to the manufacturing process.
- This voltage represents the sound energy that has been received.
- the voltage is then transmitted to an electric circuit (e.g., an integrated circuit such as an application specific integrated circuit (ASIC)). Further processing of the signal may be performed on the electrical circuit. For instance, amplification or filtering functions may be performed on the voltage signal at the integrated circuit.
- ASIC application specific integrated circuit
- FIG. 3 another example of a stitch that is shaped differently from the example of FIGS. 1 and 2 is described.
- the elements of FIG. 3 are the same as those in FIGS. 1 and 2 so that their descriptions are not repeated here.
- FIG. 3 illustrates that stitches can take on a number of different shapes and dimensions.
- FIG. 4 one example of a method for making an ECM microphone with a stitch is described.
- the b-stage epoxy/polyimide (e.g., Kapton) assembly is removed from frozen storage.
- the assembly is kept frozen prior to use to prolong its life by decelerating cure and to make it easier to handle, as it is not as tacky in the frozen or chilled state.
- the shape of the stitch is cut out which can be accomplished using a conventional die stamping process or by using a laser cutting process.
- the epoxy/polyimide (e.g., Kapton) stitch is put down over the charge plate and diaphragm ring, bridging the gap between them, and tacking their position.
- the epoxy/polyimide (e.g., Kapton) stitch and its adjacent components (charge plate and diaphragm ring) are put in an oven and heated (e.g., at 90 degrees Celsius) for approximately two hours whereas, the oven process renders the stitch attached to the diaphragm and the charge plate, and they are removed from the oven.
- the epoxy/polyimide film assembly functions as a mechanical support; however, it will be appreciated that the principles described herein can also be applied to other functions, such as creating an air tight seal around the perimeter of the microphone diaphragm.
- the device is a microphone; however, it will be appreciated that the principles described herein can also be applied to other types of devices, such as armature balanced receivers.
Abstract
Description
Claims (17)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/273,041 US9398389B2 (en) | 2013-05-13 | 2014-05-08 | Apparatus for securing components in an electret condenser microphone (ECM) |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201361822590P | 2013-05-13 | 2013-05-13 | |
US14/273,041 US9398389B2 (en) | 2013-05-13 | 2014-05-08 | Apparatus for securing components in an electret condenser microphone (ECM) |
Publications (2)
Publication Number | Publication Date |
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US20140334646A1 US20140334646A1 (en) | 2014-11-13 |
US9398389B2 true US9398389B2 (en) | 2016-07-19 |
Family
ID=51864805
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/273,041 Active 2034-05-15 US9398389B2 (en) | 2013-05-13 | 2014-05-08 | Apparatus for securing components in an electret condenser microphone (ECM) |
Country Status (5)
Country | Link |
---|---|
US (1) | US9398389B2 (en) |
CN (1) | CN105284130B (en) |
DE (1) | DE112014002383T5 (en) |
DK (1) | DK201570810A1 (en) |
WO (1) | WO2014186224A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9398389B2 (en) | 2013-05-13 | 2016-07-19 | Knowles Electronics, Llc | Apparatus for securing components in an electret condenser microphone (ECM) |
US11081285B2 (en) | 2019-05-08 | 2021-08-03 | Deborah Duen Ling Chung | Electrically conductive electret and associated electret-based power source and self-powered structure |
Citations (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4063050A (en) | 1976-12-30 | 1977-12-13 | Industrial Research Products, Inc. | Acoustic transducer with improved electret assembly |
US4316062A (en) | 1979-12-28 | 1982-02-16 | Beveridge Harold N | Electrostatic electroacoustic transducer |
US4701640A (en) | 1985-03-11 | 1987-10-20 | Telex Communications, Inc. | Electret transducer and method of fabrication |
US4730283A (en) | 1986-09-15 | 1988-03-08 | Industrial Research Products, Inc. | Acoustic transducer with improved electrode spacing |
US4764690A (en) | 1986-06-18 | 1988-08-16 | Lectret S.A. | Electret transducing |
US4815560A (en) | 1987-12-04 | 1989-03-28 | Industrial Research Products, Inc. | Microphone with frequency pre-emphasis |
EP0533284A1 (en) | 1991-09-17 | 1993-03-24 | Microtronic Nederland B.V. | Electroacoustic transducer of the electret type |
WO1993018627A1 (en) | 1992-03-05 | 1993-09-16 | Knowles Electronics, Inc. | Electret microphone assembly, and method of manufacture |
US5335286A (en) | 1992-02-18 | 1994-08-02 | Knowles Electronics, Inc. | Electret assembly |
US5548658A (en) | 1994-06-06 | 1996-08-20 | Knowles Electronics, Inc. | Acoustic Transducer |
US20030034536A1 (en) | 2000-12-22 | 2003-02-20 | Bruel & Kjaer Sound & Vibration Measurement A/S | Micromachined capacitive electrical component |
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US20060140423A1 (en) * | 2004-12-15 | 2006-06-29 | Citizen Electronics Co., Ltd. | Condenser microphone and method for manufacturing the same |
US20060205244A1 (en) * | 2004-04-27 | 2006-09-14 | Yasuhiro Shigeno | Electret capacitor microphone |
US20060245606A1 (en) | 2005-04-27 | 2006-11-02 | Knowles Electronics, Llc | Electret condenser microphone and manufacturing method thereof |
US7136500B2 (en) | 2003-08-05 | 2006-11-14 | Knowles Electronics, Llc. | Electret condenser microphone |
US7184563B2 (en) | 2003-03-04 | 2007-02-27 | Knowles Electronics Llc. | Electret condenser microphone |
US7260230B2 (en) | 2003-10-24 | 2007-08-21 | Knowles Electronics, Llc. | High performance microphone and manufacturing method thereof |
JP2007295308A (en) | 2006-04-25 | 2007-11-08 | Citizen Electronics Co Ltd | Method of manufacturing electret capaciter microphone |
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US20090097687A1 (en) | 2007-10-16 | 2009-04-16 | Knowles Electronics, Llc | Diaphragm for a Condenser Microphone |
US20090226012A1 (en) | 2006-04-19 | 2009-09-10 | Hosiden Corporation | Electret Condenser Microphone |
US20110233692A1 (en) | 2008-12-12 | 2011-09-29 | Takeshi Inoda | Microphone unit and voice input device using same |
US8085956B2 (en) | 2007-12-14 | 2011-12-27 | Knowles Electronics, Llc | Filter circuit for an electret microphone |
US8144898B2 (en) | 2003-10-24 | 2012-03-27 | Knowles Electronics, Llc | High performance microphone and manufacturing method thereof |
CN102582073A (en) | 2010-09-08 | 2012-07-18 | 美商楼氏电子有限公司 | Method for forming blunt terminal on pipe |
US8401209B2 (en) | 2009-04-23 | 2013-03-19 | Knowles Electronics, Llc | Microphone having diaphragm ring with increased stability |
US20130094676A1 (en) * | 2011-10-18 | 2013-04-18 | Hosiden Corporation | Electret Condenser Microphone |
US8542852B2 (en) * | 2008-04-07 | 2013-09-24 | National University Corporation Saitama University | Electro-mechanical transducer, an electro-mechanical converter, and manufacturing methods of the same |
US20140334646A1 (en) | 2013-05-13 | 2014-11-13 | Knowles Electronics, Llc | Apparatus For Securing Components In An Electret Condenser Microphone (ECM) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5028291B2 (en) * | 2008-01-31 | 2012-09-19 | 三洋電機株式会社 | Device mounting substrate, device mounting substrate manufacturing method, semiconductor module, and semiconductor module manufacturing method |
-
2014
- 2014-05-08 US US14/273,041 patent/US9398389B2/en active Active
- 2014-05-09 CN CN201480025658.6A patent/CN105284130B/en active Active
- 2014-05-09 WO PCT/US2014/037481 patent/WO2014186224A1/en active Application Filing
- 2014-05-09 DE DE112014002383.3T patent/DE112014002383T5/en active Pending
-
2015
- 2015-12-08 DK DK201570810A patent/DK201570810A1/en not_active Application Discontinuation
Patent Citations (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4063050A (en) | 1976-12-30 | 1977-12-13 | Industrial Research Products, Inc. | Acoustic transducer with improved electret assembly |
US4316062A (en) | 1979-12-28 | 1982-02-16 | Beveridge Harold N | Electrostatic electroacoustic transducer |
US4701640A (en) | 1985-03-11 | 1987-10-20 | Telex Communications, Inc. | Electret transducer and method of fabrication |
US4764690A (en) | 1986-06-18 | 1988-08-16 | Lectret S.A. | Electret transducing |
US4730283A (en) | 1986-09-15 | 1988-03-08 | Industrial Research Products, Inc. | Acoustic transducer with improved electrode spacing |
US4815560A (en) | 1987-12-04 | 1989-03-28 | Industrial Research Products, Inc. | Microphone with frequency pre-emphasis |
EP0533284A1 (en) | 1991-09-17 | 1993-03-24 | Microtronic Nederland B.V. | Electroacoustic transducer of the electret type |
US5335286A (en) | 1992-02-18 | 1994-08-02 | Knowles Electronics, Inc. | Electret assembly |
WO1993018627A1 (en) | 1992-03-05 | 1993-09-16 | Knowles Electronics, Inc. | Electret microphone assembly, and method of manufacture |
US5408534A (en) | 1992-03-05 | 1995-04-18 | Knowles Electronics, Inc. | Electret microphone assembly, and method of manufacturer |
US5548658A (en) | 1994-06-06 | 1996-08-20 | Knowles Electronics, Inc. | Acoustic Transducer |
US6532293B1 (en) | 2000-02-08 | 2003-03-11 | Knowles Electronics Llc | Acoustical transducer with reduced parasitic capacitance |
US6684484B2 (en) | 2000-02-08 | 2004-02-03 | Knowles Electronics, Llc | Method for manufacturing acoustical transducer with reduced parasitic capacitance |
US6704427B2 (en) | 2000-02-24 | 2004-03-09 | Knowles Electronics, Llc | Acoustic transducer with improved acoustic damper |
US20030034536A1 (en) | 2000-12-22 | 2003-02-20 | Bruel & Kjaer Sound & Vibration Measurement A/S | Micromachined capacitive electrical component |
US6654473B2 (en) | 2001-05-09 | 2003-11-25 | Knowles Electronics, Llc | Condenser microphone |
JP2003209899A (en) | 2002-01-11 | 2003-07-25 | Audio Technica Corp | Condenser microphone |
US7184563B2 (en) | 2003-03-04 | 2007-02-27 | Knowles Electronics Llc. | Electret condenser microphone |
US7136500B2 (en) | 2003-08-05 | 2006-11-14 | Knowles Electronics, Llc. | Electret condenser microphone |
US8144898B2 (en) | 2003-10-24 | 2012-03-27 | Knowles Electronics, Llc | High performance microphone and manufacturing method thereof |
US7260230B2 (en) | 2003-10-24 | 2007-08-21 | Knowles Electronics, Llc. | High performance microphone and manufacturing method thereof |
US20060205244A1 (en) * | 2004-04-27 | 2006-09-14 | Yasuhiro Shigeno | Electret capacitor microphone |
US20060140423A1 (en) * | 2004-12-15 | 2006-06-29 | Citizen Electronics Co., Ltd. | Condenser microphone and method for manufacturing the same |
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US20090226012A1 (en) | 2006-04-19 | 2009-09-10 | Hosiden Corporation | Electret Condenser Microphone |
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US20110233692A1 (en) | 2008-12-12 | 2011-09-29 | Takeshi Inoda | Microphone unit and voice input device using same |
US8401209B2 (en) | 2009-04-23 | 2013-03-19 | Knowles Electronics, Llc | Microphone having diaphragm ring with increased stability |
CN102582073A (en) | 2010-09-08 | 2012-07-18 | 美商楼氏电子有限公司 | Method for forming blunt terminal on pipe |
US20130094676A1 (en) * | 2011-10-18 | 2013-04-18 | Hosiden Corporation | Electret Condenser Microphone |
US20140334646A1 (en) | 2013-05-13 | 2014-11-13 | Knowles Electronics, Llc | Apparatus For Securing Components In An Electret Condenser Microphone (ECM) |
Non-Patent Citations (1)
Title |
---|
International Search Report and Written Opinion for PCT/US2014/037481, dated Sep. 12, 2014, 10 pages. |
Also Published As
Publication number | Publication date |
---|---|
CN105284130A (en) | 2016-01-27 |
US20140334646A1 (en) | 2014-11-13 |
DK201570810A1 (en) | 2015-12-21 |
WO2014186224A1 (en) | 2014-11-20 |
DE112014002383T5 (en) | 2016-01-21 |
CN105284130B (en) | 2019-04-05 |
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